Pretty cool idea for the mechanics! I would really like to play the full version of a game like this. Hope you continue with your project!
A few minor gripes: there's an option to rotate wires by 45 degrees, but wires don't seem to transfer anything diagonally. Also, enemies at the start have waaay to much health, I think.
As to volume controls: the problem is it's probably controlled from the interface in a linear scale, but the audio manager needs to convert it to exponential scale in decibels. Hope this info helps.
Edit: Oh, I'm so dumb, wires don't rotate diagonally, it's just me visualizing things wrong. Sorry for that.
Also I wish there was some kind of visual indication of the reload (or bullet production) process, as right now I just have to spam fire to know whether I can shoot or not.